Stone River Products Metric O-Ring Kit 350pc, 18 Sizes 3mm-20mm ID x 1mm CS, Buna-N NBR 70A Nitrile Rubber Seals Assortment for Hydraulic Pneumatic Automotive, Case Included

Be ready for leaks, rebuilds, and routine maintenance with the Stone River Products Metric O-Ring Kit. This assortment includes 350 Buna-N metric O-rings in a convenient organizer case, covering 18 commonly used sizes from 3mm to 20mm inside diameter, all in a 1.0mm cross section. These are standard-grade Buna-N Nitrile (NBR) 70 Shore A seals—one of the most widely used elastomers in industrial and automotive sealing. NBR is valued for its reliability and cost-effective performance, especially in oil and fluid environments. Material Performance Buna-N (NBR) Seals are typically resistant to: Mineral oil-based lubricants & greases Many grades of hydraulic fluids Aliphatic hydrocarbons Silicone oils & greases Water (to about 80°C) That makes this kit a smart choice for service benches, toolboxes, field kits, and anyone working with metric equipment. Kit Contents (1.0mm CS – 18 Sizes / 350 Total) 3mm ID – 25 pcs 4mm ID – 25 pcs 5mm ID – 25 pcs 6mm ID – 25 pcs 7mm ID – 25 pcs 8mm ID – 20 pcs 9mm ID – 20 pcs 10mm ID – 20 pcs 11mm ID – 20 pcs 12mm ID – 20 pcs 13mm ID – 20 pcs 14mm ID – 15 pcs 15mm ID – 15 pcs 16mm ID – 15 pcs 17mm ID – 15 pcs 18mm ID – 15 pcs 19mm ID – 15 pcs 20mm ID – 15 pcs Whether you’re servicing hydraulic tools, pneumatic systems, automotive components, or general industrial equipment, this kit keeps the right size close at hand.

• Complete Metric Assortment for Fast Repairs Includes 350 metric O-rings in 18 popular sizes from 3mm to 20mm inside diameter, all with a 1.0mm cross section—ideal for common metric sealing needs.
• Buna-N Nitrile Rubber (NBR) 70A Made from standard-grade NBR 70 Shore A for dependable sealing and long service life. Great resistance to mineral oil–based lubricants and greases, many hydraulic fluids, aliphatic hydrocarbons, silicone oils/greases, and water up to about 80°C.
• 1.0mm Cross-Section = Versatile Fitment The consistent 1.5mm CS makes this kit perfect for metric fittings, pumps, valves, and equipment where space and precision matter.
• Organized, Durable Storage Case O-rings arrive sorted in a labeled plastic organizer case, making size selection quick and keeping your shop, toolbox, or service truck clean and efficient.
• Ideal for Hydraulic, Pneumatic, Automotive & General MRO Great for maintenance, repair, and service work on machinery, vehicles, appliances, and industrial systems—reducing downtime and preventing leaks.